Leather-scarfing machine.



J. F. DONNE L H. LYON.

LEATHER. SGA Gr MACHINE. PPPPPPPPPPPPPPPPPPPPPPPPP 0.

1,018,171. PatenteafFeb. 20, 1912.

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J. F. DONNBLLY & H. LYON.

LEATHER SGARFING MACHINE.

APPLICATION PILPD JULY?, 1910.

1,018,171 y .Patented Feb.2o,1912.

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J. F. DONNELLY & H. LYON.

LEATHER SGARPING MACHINE.

'APPLIOATION FILED JULY 7, 1910.

1,018,171 Patented Feb. 20, 1912.

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NETE@ STATES PATENT FFCE.

JOHN F. DONNELLY AND HAR-RY LYON, OF BROCKTON, MASSACHUSETTS; SAID LYONASSIGNOR T0 SAID DONNELLY.

LEATHER-SCARFNG MACHINE.

Specification of Letters Patent.

Application filed July 7, 1910. Serial No. 576,753.

To all whom it' ymay concern:

Be it known that we, JOHN F. DONNELLY and HARRY LYON, citizens of theUnited States, residing at Brockton, county of Plymouth, State ofMassachusetts, have invented an Improvement in Leather-ScariingMachines, of which the following description, in connection with theaccompanying drawing, is a specification, like characters on the drawingrepresenting like parts.

This invention relates to leather-scarfing machines of that type whereina stationary knife is used and the scarfing operation is performed bymoving the leather transversely of the cutting edge of the knife at thesame time that it is moved longitudinally.

One object of our invention is to provide a machine of this type whichwill cut the scarf so that the edge thereof will be comparatively thickinstead of tapering to a knife edge, and sothat at the point where thescarf begins the leather will be cut to form a gouge or shoulder, all aswill be more fully hereinafter described and claimed.

In the drawings wherein we have illustrated the preferred embodiment ofour invention, Figure 1 is a side view of the machine embodying theinvention; Figs. 2, 3 and 4 are views showing the manner in which thescarf is made; Fig. 5 is a top plan view of the machine; Fig. 6 is anedge view and Fig. 7 is a side view of the cam for giving transversemovement to the feed rolls; Fig. S is a view showing the manner in whichthe two pieces of leather scarfed on our machine may be splicedtogether; Fig. 9 is a section on the line m-m, Fig. 5; Fig. 10 is asection similar to Fig. 9 showing the parts in diiferent position; Fig.11 is a section on the line g/-g/, Fig. 6; Fig. 12 is an enlarged viewof two scarfed ends of leather applied to each other as they would be inmaking a joint.

The scariing of the leather is accomplished by a knife 3 which isstationary and the leather to be scarfed is fed forward against theknife by means of two feed rolls 4, 5. The knife is shown as supportedby a holder 6 which is adjustably carried by the frame 7 of the machine.This holder is received between the two side pieces 8 of the frame andis held in position by two screws 9 that pass through the side piecesinto the sides of the holder. Said holder is adapted to be adjusted intodifferent angular positions so as to vary the angular position of thecutting edge of the knife, and for this purpose said holder is providedwith the arm 10 having the curved slot 11 which is concentric with thescrews 9 and through which enters a clamping screw 12 secured inthe sideof the frame. By loosening the clamping screw the holder may be turnedabout the bolts 9, as will be obvious, thus changing the angularposition of the knife.

The knife is slotted as usual and is clamped to the holder by clampingscrews 14, this construction providing for adjustment of the knifetoward and from the feeding rolls. The roll 5 is in the nature of apresser-roll, and the roll 4 is positively actuated for feeding theleather 15 forward. The surface of the roll 4 may be roughened ifdesired for facilitating the feeding operation. We have shown the roll 4as an oscillating member, rather than a rotary member, but it would bewithin our invention to have the roll 4 make a complete rotation ratherthan to merely oscillate. Said oscillating roll 4 isjournaled in twoboxes or bearings 16 that are slidably mounted in slots 17 formed in thesides of the frame, and this roll is yieldingly supported by springs 19which encircle guide-pins 2O depending from the boxes and which bear onthe bushings 21 that are screw-threaded into the base of the frame. Theguide-pins 20 extend down through the bushings and are guided thereby,and each guide-pin carries' at its lower end a headed screw 22 whichpasses through a bracket 23, the head 24 of the screw acting to'limitthe upward movement of the guide-pins 2O and boxes 16 by its engagementwith said bracket. An adjustment of the bushings 21 will eEect anadjustment of the tension of the springs 19, and by adjusting the screws22 in the ends of the pins the normal position of the roll 4 may bevaried. The roll 5 is sustained in two boxes 25 that are also mounted inthe slot 17, and we will preferably employ springs 26 between the boxes,which springs operate normally to elevate the roll 5.

The roll 4 may be oscillated in any suitable way, although we haveherein shown for this purpose an arm 27 fast on the en d raten-tea Feb.2o, i912.

of the shaft of the roll and connected by a link 28 with a lever 29 thatis pivoted to the frame at 30 and slotted at 90. The lever 29 isactuated by a crank pin or roll 8l which is received in the slot 90 andis rigid with a sha-ft This shaft may be driven in any suitable way andwe hare herein shown a gear 32 fast on the shaft and meshing with anddriven from a pinion 84 on a driving shaft 85 which has the drivingpulley 36 thereon. lli/lith this construction it will be observed thatat each rotation of the gear 32 the feed roll 4 will oscillate forwardlyand then backwardly to its normal posit-ion again. le will preferablyprovide some suitable clutch mechanism (not shown) between the pulley 8Gand the shaft 35 for bringing the machine to rest after the gear 32 hasmade each complete revolution.

As stated above, the scarfing operation is performed by moving the feedrolls 4 and 5 transversely of the cutting edge of the knife 8 duringtheir feeding movement, and in the present embodiment of our inventionwe provide for. this transverse movement of the feed rolls by thefollowing mechanism: Each box 25 has extending therefrom a projectionpreferably in the form of a screw 37, and these projections 87 are actedon by rolls 88 carried by arms 38 rigid with a rock shaft 40. The shaft40 has extending therefrom another arm 4i carrying a roll at its endwhich is adapted to be engaged by a.

cam member 42 mounted on the shaft 88, said cam member being constructedand timed to rock the shaft 40 thereby to depress the upper roll duringthe forward feeding movement of the roll 4.

lll/Then the machine is at rest the roll 5 is normally elevated from theroll 4 by the springs 2G suriiciently to permit the piece of leather 15to be scarfed to be inserted between the rolls, as seen in Figs. 2 and9, an adjustable gage 45 being provided to properly position theleather. lhen the machine starts to operate the first movement is todepress the roll 5 `onto the leather l5 and then to force hoth rolls andthe leather downwardly to bring the leather hard against the edge of theknife, as shown in Fig. 2. At this time the roll 4 begins its forwardfeeding movement and during such movement the cam 42 continues therocking movement of the shaft 40 and the consequent downward movement ofthe rolls transversely to the cutting edge of the knife, thereby causingthe knife to cut diagonally through the leather 15. By bringing the roll5 firmly onto the leather and the leather firmly onto the edge of theknife before the forward feeding movement of the roll 4 begins, theleather will be cut, as shown in Fig. 8, that is, the knife will firstcut a sort of gouge 48 in the work and thereafter said knife will cutstraight through the work diduced.

agonally, this being due to the fact that the leather is pressed hardagainst the knife before the roll 4 begins to turn. Moreover, by thismeans the line where the knife enters the work will be perfectly squareand a square cut can be produced.

lWe prefer to scarf the leather so that the end of the scarf will have ablunt or thick edge 49, as shown in Fig. 3, rather than a knife edge,and this may be accomplished by properly positioning the gage 45 and byso timing the transverse move peut of the rolls that the knife willemerge from the strip of leather at the end, as seen in Fig. 3, ratherthan at the side. A piece of leather scarfed in this way has a thickenedend 49 at one end of the scarf and a shoulder or gouge 48 at the otherend. rllhe advantage of scarfing leather in this way is that a muchbetter joint can be made -where the two searfed ends are sewed togetheras, for instance, in the formation of a belt, for upon referring toFigs. 8 and 12, it will be seen that when the two scarfed ends arebrought into juxtaposition the thickened edge 49 on one end will fitinto the gouge 48 on the other end and a perfectly smooth joint can bepro- 1V here the leather is scarfed to a feather edge the thin orfeather edge is very likely to become broken or torn after the belt hasworn some, but with the thickened edge 49 this does not happen, and hymaking the gouge 48 the leather can be scarfed with the thickened edgeand a splice can be made which is perfectly smooth and without anyportions that are thicker than the body of the belt. The cam 42 forgiving this lateral movement to the rolls 4 and 5 is especially made soas to permit the scarf to be of different lengths and so as to make moreor less of a gouge 48 at the beginning of the scarf, as desired. Asherein shown we have provided the cam 42 with the adjustable section 50which is arranged so that the eccentricity thereof can be varied, aswell 'as the abruptness of the rise thereof. As herein shown this camsection 50 is pivoted at one end upon the eccentric portion 5l of a pin52 that is mounted in a boss 58 formed on the cam member 42, said pinhaving the thumb-piece 54 by which it may be turned. The turning of thispin 51 will throw the end 55 of the cam section 50 radially or towardand from the axis of the cam 42.' The other end of the cam section 50rests on the end of the adjusting screw 5G which is screw-threaded intothe body of the cam 42 so that by manipulating said screw 56 the end 57of the cam section may be thrown toward or from the center. The lengthof the scarf depends upon the eccentricity of the surface of the camsection 50 and this depends upon the adj ust-ment of the screw 5G. Themain portion of the cam member 42 is concentric and the movement of theroll 5 against the leather and that of the leather against the knifeblade before the roll 4 begins its movement is accomplished by the end55 of the cam section and by adjusting the pin 52 the amount of theinitial movement of the rolls transversely of the knife can be regulatedand thereby the depth of the gouge 48. We will preferably provide theslot 90 and lever 29 with the curved or concentric portion 91 so thatthe roll 4 will remain at rest while the roll 5 is being brought againstthe leather and the leather against the knife blade and so that theforward feeding movementof the roll 4 will not occur until after theleather is firmly pressed against the cutting edge of the knife.

While we have described one embodiment of our invention we do not wishto be limited thereto as various changes may be made -in theconstruction without departing from the scope and spirit of theinvention.

Having fully described our invention, what we claim as new and desire tosecure by Letters Patent is 1. In a leather-scarng machine, thecombination with a knife, of feeding means to feed leather toward theknife, means operating automatically in timed relation with said feedingmeans to produce a relative movement between the feeding means and theknife in a direction transverse to the feeding movement of the leatherbefore the feeding means begins its movement thereby to bring theleather firmly against the knife edge and after the feeding means hascommenced to move the leather toward the knife to continue to producesuch relative movement whereby the knife will enter the leather abruptlyand then cut diagonally across the leather.

2. In a leather-Scarfing machine, the combination with a knife, of afeeding roll movable toward the knife in a direction transverse to thedirection of feed, a rocking member to give transverse movement to theroll, a shaft for operating the feed roll, al cam on said shaft forrocking the member to give the feeding roll its transverse movement, andmeans for operating the shaft.

3. In a leather-scarfing machine, the combination with a knife, offeeding rolls mounted to move bodily transversely to the direction offeeding movement, an actuator for giving the rolls such transversemovement, a cam having an adjustable section to engage and operate saidactuator, and means to adjust either end of said cam section radially.

4. In a leather-scarfing machine, the combination with al knife, offeeding rolls mounted to move bodily transversely to the direction offeeding movement, an actuator for giving the rolls such transversemovement, a cam having a pivoted cam section to engage and operate saidactuator, and means to swing said cam section about its pivot to varythe eccentricity thereof.

5. In a leather-scarfing machine, the combination with a. knife, offeeding rolls mounted to move bodily transversely to the direction offeeding movement, an actuator for giving the rolls such transversemovement, a cam having an adjust-able section to engage and operate saidactuator, and means to adjust the leading end of said cam sectionradially.

6. In a leather-scarfing machine, the combination with a knife, offeeding rolls mounted to move bodily transversely to the direction offeeding movement, an actuator for giving the rolls such transversemovement, a cam having a pivotedcam section to engage and operate saidactuator, means to swing said cam section about its pivot to vary theeccentricity thereof, and means to adjust the pivot of the cam sectionradially.

7. In a leather-scariing machine, the com- .bination with a frame, of ahorizontallyarranged knife sustained thereby, an oscillating feed roll,a presser roll cooperating with the feed roll, a rotary member having acrank pin, and a lever connected to the oscillating roll and pivotedeccentrically of said rotary member, said lever having a slot in whichthe crank pin works.

8. In a leather-scarfing machine, the combination with a knife, of afeed roll to feed leather toward the knife, said roll being mounted formovement in a direct-ion transverse to that of the feeding movement,feedroll-rotating mechanism, means operating automatically in timedrelation with vsaid feed-roll-rotating mechanism to move the feed rollrelative to the knife in a direction transverse to the feeding movementof the leather so as to bring the leather firmly against the knife priorto the commencement of the feeding movement, said means operating tocontinue such transverse movement while the feed roll is operating, andmeans to vary the amount which the feed roll moves transversely whilethe leather is being fed forward.

9. In a leather-scarfing machine, the combination with a knife, of afeed roll, sliding boxes in which said roll is mounted, projectionsextending from said boxes, a rock shaft, arms on t-he rock shaftengaging said projections, a shaft connected to the feed roll foroperating the latter, and a cam on said shaft for operating the rockshaft thereby to give transverse movement t-o the feed roll. Y

10. In a leatherscaring machine, the combination with a knife, of a feedroll, sliding boxes in which said roll is mounted, projections extendingfrom said boxes, a rock shaft, arms on the rock shaft engaging saidprojections, a shaft connected to the feed roll for operating` thelatter, and a cam on said shaft cooperating to give the rock shaft aninitial turning movement before the feed roll begins its feedingmovement and to continue the turning movement of the rock shaft Whilethe feed roll is rotating. l1. In a leather-Scarlino:` machine, thecombination with a knife, of feed rolls mounted to move bodilytransversely to the direction of feeding movement, an actuator forgiving the rolls such transverse movement, and a cam having' anadjustable seetion to engage and operate said actuator.

l2. In a leather-scarfing` machine, the combination with a knife, offeed rolls mounted to move bodily transversely to the direction offeeding movement, an actuator for giving the rolls such transversemovement, a shaft, connections between said shaft and feed rolls bywhich the latter are operated from the former, and a Cam on said shafthavingv an adjustable section to engage and operate the actuator.

In testimony whereof, We have signed our names to this specification, inthe presence of tivo subscribing Witnesses.

JOHN F. DONNELLY. HARRY LYON.

Vitnesses:

LOUIS C. SMITH, THOMAS J. DRUMMOND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

